target-or32: Add float instruction helpers

Add OpenRISC float instruction helpers.

Signed-off-by: Jia Liu <proljc@gmail.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

3 files changed, 335 insertions, 1 deletions

diff --git a/target-openrisc/Makefile.objs b/target-openrisc/Makefile.objs
index e2a3715f74..926fc2f476 100644
--- a/target-openrisc/Makefile.objs
+++ b/target-openrisc/Makefile.objs
@@ -1,3 +1,4 @@
 obj-$(CONFIG_SOFTMMU) += machine.o
 obj-y += cpu.o exception.o interrupt.o mmu.o translate.o
-obj-y += exception_helper.o int_helper.o interrupt_helper.o mmu_helper.o
+obj-y += exception_helper.o fpu_helper.o int_helper.o \
+         interrupt_helper.o mmu_helper.o
diff --git a/target-openrisc/fpu_helper.c b/target-openrisc/fpu_helper.c
new file mode 100644
index 0000000000..b184d5ef73
--- /dev/null
+++ b/target-openrisc/fpu_helper.c
@@ -0,0 +1,300 @@
+/*
+ * OpenRISC float helper routines
+ *
+ * Copyright (c) 2011-2012 Jia Liu <proljc@gmail.com>
+ *                         Feng Gao <gf91597@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "cpu.h"
+#include "helper.h"
+#include "exception.h"
+
+static inline uint32_t ieee_ex_to_openrisc(OpenRISCCPU *cpu, int fexcp)
+{
+    int ret = 0;
+    if (fexcp) {
+        if (fexcp & float_flag_invalid) {
+            cpu->env.fpcsr |= FPCSR_IVF;
+            ret = 1;
+        }
+        if (fexcp & float_flag_overflow) {
+            cpu->env.fpcsr |= FPCSR_OVF;
+            ret = 1;
+        }
+        if (fexcp & float_flag_underflow) {
+            cpu->env.fpcsr |= FPCSR_UNF;
+            ret = 1;
+        }
+        if (fexcp & float_flag_divbyzero) {
+            cpu->env.fpcsr |= FPCSR_DZF;
+            ret = 1;
+        }
+        if (fexcp & float_flag_inexact) {
+            cpu->env.fpcsr |= FPCSR_IXF;
+            ret = 1;
+        }
+    }
+
+    return ret;
+}
+
+static inline void update_fpcsr(OpenRISCCPU *cpu)
+{
+    int tmp = ieee_ex_to_openrisc(cpu,
+                              get_float_exception_flags(&cpu->env.fp_status));
+
+    SET_FP_CAUSE(cpu->env.fpcsr, tmp);
+    if ((GET_FP_ENABLE(cpu->env.fpcsr) & tmp) &&
+        (cpu->env.fpcsr & FPCSR_FPEE)) {
+        helper_exception(&cpu->env, EXCP_FPE);
+    } else {
+        UPDATE_FP_FLAGS(cpu->env.fpcsr, tmp);
+    }
+}
+
+uint64_t HELPER(itofd)(CPUOpenRISCState *env, uint64_t val)
+{
+    uint64_t itofd;
+    OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));
+
+    set_float_exception_flags(0, &cpu->env.fp_status);
+    itofd = int32_to_float64(val, &cpu->env.fp_status);
+    update_fpcsr(cpu);
+
+    return itofd;
+}
+
+uint32_t HELPER(itofs)(CPUOpenRISCState *env, uint32_t val)
+{
+    uint32_t itofs;
+    OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));
+
+    set_float_exception_flags(0, &cpu->env.fp_status);
+    itofs = int32_to_float32(val, &cpu->env.fp_status);
+    update_fpcsr(cpu);
+
+    return itofs;
+}
+
+uint64_t HELPER(ftoid)(CPUOpenRISCState *env, uint64_t val)
+{
+    uint64_t ftoid;
+    OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));
+
+    set_float_exception_flags(0, &cpu->env.fp_status);
+    ftoid = float32_to_int64(val, &cpu->env.fp_status);
+    update_fpcsr(cpu);
+
+    return ftoid;
+}
+
+uint32_t HELPER(ftois)(CPUOpenRISCState *env, uint32_t val)
+{
+    uint32_t ftois;
+    OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));
+
+    set_float_exception_flags(0, &cpu->env.fp_status);
+    ftois = float32_to_int32(val, &cpu->env.fp_status);
+    update_fpcsr(cpu);
+
+    return ftois;
+}
+
+#define FLOAT_OP(name, p) void helper_float_##_##p(void)
+
+#define FLOAT_CALC(name)                                                  \
+uint64_t helper_float_ ## name ## _d(CPUOpenRISCState *env,               \
+                                     uint64_t fdt0, uint64_t fdt1)        \
+{                                                                         \
+    uint64_t result;                                                      \
+    OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));                    \
+    set_float_exception_flags(0, &cpu->env.fp_status);                    \
+    result = float64_ ## name(fdt0, fdt1, &cpu->env.fp_status);           \
+    update_fpcsr(cpu);                                                    \
+    return result;                                                        \
+}                                                                         \
+                                                                          \
+uint32_t helper_float_ ## name ## _s(CPUOpenRISCState *env,               \
+                                     uint32_t fdt0, uint32_t fdt1)        \
+{                                                                         \
+    uint32_t result;                                                      \
+    OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));                    \
+    set_float_exception_flags(0, &cpu->env.fp_status);                    \
+    result = float32_ ## name(fdt0, fdt1, &cpu->env.fp_status);           \
+    update_fpcsr(cpu);                                                    \
+    return result;                                                        \
+}                                                                         \
+
+FLOAT_CALC(add)
+FLOAT_CALC(sub)
+FLOAT_CALC(mul)
+FLOAT_CALC(div)
+FLOAT_CALC(rem)
+#undef FLOAT_CALC
+
+#define FLOAT_TERNOP(name1, name2)                                        \
+uint64_t helper_float_ ## name1 ## name2 ## _d(CPUOpenRISCState *env,     \
+                                               uint64_t fdt0,             \
+                                               uint64_t fdt1)             \
+{                                                                         \
+    uint64_t result, temp, hi, lo;                                        \
+    uint32_t val1, val2;                                                  \
+    OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));                    \
+    hi = env->fpmaddhi;                                                   \
+    lo = env->fpmaddlo;                                                   \
+    set_float_exception_flags(0, &cpu->env.fp_status);                    \
+    result = float64_ ## name1(fdt0, fdt1, &cpu->env.fp_status);          \
+    lo &= 0xffffffff;                                                     \
+    hi &= 0xffffffff;                                                     \
+    temp = (hi << 32) | lo;                                               \
+    result = float64_ ## name2(result, temp, &cpu->env.fp_status);        \
+    val1 = result >> 32;                                                  \
+    val2 = (uint32_t) (result & 0xffffffff);                              \
+    update_fpcsr(cpu);                                                    \
+    cpu->env.fpmaddlo = val2;                                             \
+    cpu->env.fpmaddhi = val1;                                             \
+    return 0;                                                             \
+}                                                                         \
+                                                                          \
+uint32_t helper_float_ ## name1 ## name2 ## _s(CPUOpenRISCState *env,     \
+                                            uint32_t fdt0, uint32_t fdt1) \
+{                                                                         \
+    uint64_t result, temp, hi, lo;                                        \
+    uint32_t val1, val2;                                                  \
+    OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));                    \
+    hi = cpu->env.fpmaddhi;                                               \
+    lo = cpu->env.fpmaddlo;                                               \
+    set_float_exception_flags(0, &cpu->env.fp_status);                    \
+    result = float64_ ## name1(fdt0, fdt1, &cpu->env.fp_status);          \
+    temp = (hi << 32) | lo;                                               \
+    result = float64_ ## name2(result, temp, &cpu->env.fp_status);        \
+    val1 = result >> 32;                                                  \
+    val2 = (uint32_t) (result & 0xffffffff);                              \
+    update_fpcsr(cpu);                                                    \
+    cpu->env.fpmaddlo = val2;                                             \
+    cpu->env.fpmaddhi = val1;                                             \
+    return 0;                                                             \
+}
+
+FLOAT_TERNOP(mul, add)
+#undef FLOAT_TERNOP
+
+
+#define FLOAT_CMP(name)                                                   \
+uint64_t helper_float_ ## name ## _d(CPUOpenRISCState *env,               \
+                                     uint64_t fdt0, uint64_t fdt1)        \
+{                                                                         \
+    int res;                                                              \
+    OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));                    \
+    set_float_exception_flags(0, &cpu->env.fp_status);                    \
+    res = float64_ ## name(fdt0, fdt1, &cpu->env.fp_status);              \
+    update_fpcsr(cpu);                                                    \
+    return res;                                                           \
+}                                                                         \
+                                                                          \
+uint32_t helper_float_ ## name ## _s(CPUOpenRISCState *env,               \
+                                             uint32_t fdt0, uint32_t fdt1)\
+{                                                                         \
+    int res;                                                              \
+    OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));                    \
+    set_float_exception_flags(0, &cpu->env.fp_status);                    \
+    res = float32_ ## name(fdt0, fdt1, &cpu->env.fp_status);              \
+    update_fpcsr(cpu);                                                    \
+    return res;                                                           \
+}
+
+FLOAT_CMP(le)
+FLOAT_CMP(eq)
+FLOAT_CMP(lt)
+#undef FLOAT_CMP
+
+
+#define FLOAT_CMPNE(name)                                                 \
+uint64_t helper_float_ ## name ## _d(CPUOpenRISCState *env,               \
+                                     uint64_t fdt0, uint64_t fdt1)        \
+{                                                                         \
+    int res;                                                              \
+    OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));                    \
+    set_float_exception_flags(0, &cpu->env.fp_status);                    \
+    res = !float64_eq_quiet(fdt0, fdt1, &cpu->env.fp_status);             \
+    update_fpcsr(cpu);                                                    \
+    return res;                                                           \
+}                                                                         \
+                                                                          \
+uint32_t helper_float_ ## name ## _s(CPUOpenRISCState *env,               \
+                                     uint32_t fdt0, uint32_t fdt1)        \
+{                                                                         \
+    int res;                                                              \
+    OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));                    \
+    set_float_exception_flags(0, &cpu->env.fp_status);                    \
+    res = !float32_eq_quiet(fdt0, fdt1, &cpu->env.fp_status);             \
+    update_fpcsr(cpu);                                                    \
+    return res;                                                           \
+}
+
+FLOAT_CMPNE(ne)
+#undef FLOAT_CMPNE
+
+#define FLOAT_CMPGT(name)                                                 \
+uint64_t helper_float_ ## name ## _d(CPUOpenRISCState *env,               \
+                                     uint64_t fdt0, uint64_t fdt1)        \
+{                                                                         \
+    int res;                                                              \
+    OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));                    \
+    set_float_exception_flags(0, &cpu->env.fp_status);                    \
+    res = !float64_le(fdt0, fdt1, &cpu->env.fp_status);                   \
+    update_fpcsr(cpu);                                                    \
+    return res;                                                           \
+}                                                                         \
+                                                                          \
+uint32_t helper_float_ ## name ## _s(CPUOpenRISCState *env,               \
+                                     uint32_t fdt0, uint32_t fdt1)        \
+{                                                                         \
+    int res;                                                              \
+    OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));                    \
+    set_float_exception_flags(0, &cpu->env.fp_status);                    \
+    res = !float32_le(fdt0, fdt1, &cpu->env.fp_status);                   \
+    update_fpcsr(cpu);                                                    \
+    return res;                                                           \
+}
+FLOAT_CMPGT(gt)
+#undef FLOAT_CMPGT
+
+#define FLOAT_CMPGE(name)                                                 \
+uint64_t helper_float_ ## name ## _d(CPUOpenRISCState *env,               \
+                                     uint64_t fdt0, uint64_t fdt1)        \
+{                                                                         \
+    int res;                                                              \
+    OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));                    \
+    set_float_exception_flags(0, &cpu->env.fp_status);                    \
+    res = !float64_lt(fdt0, fdt1, &cpu->env.fp_status);                   \
+    update_fpcsr(cpu);                                                    \
+    return res;                                                           \
+}                                                                         \
+                                                                          \
+uint32_t helper_float_ ## name ## _s(CPUOpenRISCState *env,               \
+                                     uint32_t fdt0, uint32_t fdt1)        \
+{                                                                         \
+    int res;                                                              \
+    OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));                    \
+    set_float_exception_flags(0, &cpu->env.fp_status);                    \
+    res = !float32_lt(fdt0, fdt1, &cpu->env.fp_status);                   \
+    update_fpcsr(cpu);                                                    \
+    return res;                                                           \
+}
+
+FLOAT_CMPGE(ge)
+#undef FLOAT_CMPGE
diff --git a/target-openrisc/helper.h b/target-openrisc/helper.h
index b4128ac3f6..635c69c423 100644
--- a/target-openrisc/helper.h
+++ b/target-openrisc/helper.h
@@ -22,6 +22,39 @@
 /* exception */
 DEF_HELPER_FLAGS_2(exception, 0, void, env, i32)
 
+/* float */
+DEF_HELPER_FLAGS_2(itofd, 0, i64, env, i64)
+DEF_HELPER_FLAGS_2(itofs, 0, i32, env, i32)
+DEF_HELPER_FLAGS_2(ftoid, 0, i64, env, i64)
+DEF_HELPER_FLAGS_2(ftois, 0, i32, env, i32)
+
+#define FOP_MADD(op)                                             \
+DEF_HELPER_FLAGS_3(float_ ## op ## _s, 0, i32, env, i32, i32)    \
+DEF_HELPER_FLAGS_3(float_ ## op ## _d, 0, i64, env, i64, i64)
+FOP_MADD(muladd)
+#undef FOP_MADD
+
+#define FOP_CALC(op)                                            \
+DEF_HELPER_FLAGS_3(float_ ## op ## _s, 0, i32, env, i32, i32)    \
+DEF_HELPER_FLAGS_3(float_ ## op ## _d, 0, i64, env, i64, i64)
+FOP_CALC(add)
+FOP_CALC(sub)
+FOP_CALC(mul)
+FOP_CALC(div)
+FOP_CALC(rem)
+#undef FOP_CALC
+
+#define FOP_CMP(op)                                              \
+DEF_HELPER_FLAGS_3(float_ ## op ## _s, 0, i32, env, i32, i32)    \
+DEF_HELPER_FLAGS_3(float_ ## op ## _d, 0, i64, env, i64, i64)
+FOP_CMP(eq)
+FOP_CMP(lt)
+FOP_CMP(le)
+FOP_CMP(ne)
+FOP_CMP(gt)
+FOP_CMP(ge)
+#undef FOP_CMP
+
 /* int */
 DEF_HELPER_FLAGS_1(ff1, 0, tl, tl)
 DEF_HELPER_FLAGS_1(fl1, 0, tl, tl)